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Why is light or heat essential for chlor...

Why is light or heat essential for chlorination of alkanes ?

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`overset(*)Cl` free radical is required for the initiation of the reaction between an alkane and chlorine, i.e., homolysis of Cl-Cl bond is necessary . The energy required for this homolysis derived from light or heat. So, light or heat is essential for chlorination of alkanes.
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